Die-stock.



PATENTED DEC. 26, 1905.

F. V. ANDERSON.

DIE STOCK.

2 sums sunn'r 1.

APPLICATION FILED AUG. 7.1905.

N Smawtoz flan/f M Andaman,

-- In J H v, (w f No. 808,592. PATENTED DEO.26,1905.

F. v. ANDERSON.

DIE STOCK.

APPLICATION FILED AUG. 7,1905.

2 SHEETS-SHEET 2.

UNITED STATES PATENT @FFIOE.

FRANK V. ANDERSON, OF OENTRALIA, ILLINOIS, ASSIGNOR OF ONE-HAL TO JAMESB. GRAGG, OF OENTRALIA, ILLINOIS.

DIE-STOCK.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed August '7, 1905. Serial No. 278,123.

To all whom it nmq concern:

Be it known that I, FRANK V. ANDERSON, a citizen of the United States,residing at Oentralia, in the county of Marion and State of Illinois,have invented certain new and useful Improvements in Die-Stocks; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the' art to whichit appertains to make and use the same.

My invention relates to improvements in die-stocks of that class adaptedfor cutting tapered screw-threads upon gas-pipe, tubing, rods, and thelike.

The object of the invention is to provide a simple, durable, andefficient machine in which there will be but little friction, so thatless power will be required to operate it and more perfect work will beproduced.

With the above and other objects in. view the invention consists ofcertain novel fea tures of construction, combination, and arrangement ofparts, as will be more fully described, and particularly pointed out inthe appended claims.

In the accompanying drawings, Figure 1 is a side View of my improveddie-stock, one half of it being shown in elevation and the other half insection. Fig. 2 is an end view of the same, also showing one half inelevation and the other half in section; and Figs. 3 and 4 aretransverse sections taken, respec tively, on the lines 3 3 and 4 4 inFig. 1.

The embodiment of the invention illustrated in the drawings comprises atubular frame 1, which consists of two sections 2 and 3,-through whichthe work is adapted to extend. The section or member 3 carries a seriesof thread cutting dies or chasers 4, while the section or member2carries a work clamping device 5, and said sections or mem bers have ascrew-threaded engagement with each other, as shown at 6. so that thecutting-dies will be fed to the work when the section or member 3 isrotated upon the section or member 2, the thread 6 serving as afeeding-screw. The work-clamping device comprises a guide-sleeve 7,which projects into the outer end of the section 2 and is adapted toreceive the gaspipe or other work to be screw threaded and which isformed with apertures 8 to receive the inner ends of a series ofradially-disposed clamping-screws 9. The latter have finger-pieces upontheir outer ends, and their inner ends are beveled. or sharpened to bitethe outer surface of the work.

The cutting-dies 4 are in the form of small blocks of steel whichproject through and slide in radially-disposed slots 10, formed in theouter portion of the section 3, which latter carries handles 11 or othersuitabledevices by means of which it may be rotated. In order to cut thethread on a taper, the dies 4 are slidably mounted and have their outerends engaged by the forward ends of levers 12, which are pivotedintermediate their ends, as shown at 13, between ears or lugs 14, formedupon the section 3, as clearly shown in Fig. 4 of the drawings. Theopposite ends of the levers 12 engage and slide upon the outer taperedface of a cone-shaped spool or sleeve 15, which is loosely mounted uponthe section 2 between an annular shoulder 16 and a circular nut 17. Thelatter is engaged with the screw-threads 6 upon the section 2 and isdisposed within an annular recess 18, formed in the spool or sleeve 15.The levers 12 project between spaced lugs 19, which are formed upon thespool and are adapted to coact with lugs 20, formed upon the ends ofsaid levers. The engagement of the lugs with the lugs 19 limits theoutward movement of the section 3 on the section 2, and the engagementof the lugs 19 with the opposite sides of the levers 12 causes thesleeve or spool 15 to rotate with the section 3 and upon the section 2,said spool being held against longitudinal movement by the nut 17 Inorder to hold the work concentric within the frame and to keep theshavings from the feed-screw 6 of the section 3, I provide within thelatter a combined guide and guard 21, which is in the form of acylindrical sleeve adapted to have one end abut against the inner facesof the dies 4 and its other end formed with a beveled portion 22, whichserves to guide the work when inserted.

The operation of the device is -as follows: When it is desired to out atapered screw thread upon a gas-pipe or the like, the section 3 isscrewed out upon the section 2 until the lugs 20 engage the lugs 19 oruntil they are adjacent thereto. The gas-pipe or other work is theninserted in the frame through its rear end and the section 2 is clampedto it by tightening the thumb-screws 9. The section 3 is then rotated tocause the dies 4 to advance upon the end of the pipe and cutscrewthreads therein, the threads being the same as the threads of thefeeding-screw 6. As the section 3 moves inwardly upon the section 2 therear ends of the levers 12 will slide inwardly upon the tapered face ofthe cone shaped spool 15, thereby allowing said ends of the levers tocome nearer together and al lowing the opposite ends of the levers,which engage the dies 4, to move farther apart. To remove the pipe fromthe device, the section 3 is revolved in the opposite direction untilthe lugs 20 engage the lugs 19, and the thumbscrews 9 are then loosened.Owing to the small amount of cutting-surface which the dies 4 offer,there will be a comparatively small amount of friction, so that themachine will Work easier and there will be little or no danger of thethreads heating or sticking to the dies and peeling off when the latterare backed.

Various changes in the form, proportion,

and the minor details of construction may be resorted to withoutdeparting from the principle or sacrificing any of the advantages ofthis invention.

Having thus described my invention, What I claim as new, and desire tosecure by Let.- ters Patent, is

1. A device of the character described comprising a frame'consisting oftubular sections having a screw-threaded engagement with each other, awork-engaging clamp carried by one of said sections, ascrew-thread-cutting die carried by the other of said sections, a leverpivoted upon said die-carrying section and engaged at one end with saiddie, and a beveled spool upon said clamp-section adapted to engage theopposite end of said lever to cause said die to cut a tapered thread.

2. A die-stock comprising a tubular frame consisting of a die-carryingsection and a work-clamping section, said sections having ascrew-threaded engagement with each other, 4 5

set-screws upon said clamp-carrying section, a loosely-mountedcone-shaped spool upon said clamp-carrymg sectlon, a ring-nut forholding said spool in place, a series of radiallydisposed slidable diesin said die-carrying section, and a series of levers pivoted upon saiddie-carrying sections and each having one of its ends engaged with oneof said dies and its other end engaged with said spool, substantially asdescribed.

3. A die-stock comprising a tubular frame consisting of a die-carryingsection and a longitudinal movement, lugs upon said spool,

a combined guide and guard sleeve Within said diecarrying section,radially-disposed dies slidably mounted in the last-mentioned section,levers pivoted upon saiddie-carrying section and each having one endengaged with one of saiddies, and its opposite end projecting betweenthe lugs upon said spool and engaged with the outer face of the latter,and lugs upon the last-mentioned ends of the levers adapted to ooactwith the lugs upon said spool, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

FRANK V. ANDERSON. Witnesses:

JAMES B. GRAGG, EDWARD E. BARR.

